It would be great if the url is stored in the Title or Subject field of PDF's metadata.

However, it looks like there's more work to do as the table of contents links on https://en.wikipedia.org/wiki/Opera_(web_browser) don't get saved as links.

I guess those never worked, so never mind on that part.

I don't see much in the changelog that would cause it beside a Chromium update. The Chromium update has quite a few PDF changes though.

https://chromium.googlesource.com/chromium/src/+log/78.0.3895.5..78.0.3904.9?pretty=fuller&n=10000

https://blogs.opera.com/desktop/changelog-for-65/#b3454.0

If you get a chance, and can narrow it down to the first build with the problem, that'd help.

The first build in which all links are not clickable when saved to PDF - Opera Developer 65.0.3454.0

In the 63 changelog, the only PDF change I see is "DNA-78740 Save as pdf does not work on sidebar’s pane". The change is listed for 2 different builds.

In the PDF file created in Opera 65 and 66, it seems that any links are not clickable.

Didn't test Opera beta.

Opera 65.0.3467.42 Stable x64, Win10 Prof.

Do you know where do i can see programme code of this functional or it is not a public code?

Opera's source code is not public. But, Since it uses Chromium, you can look at Chromium source code.

I think Chromium and Opera's PDF functions are done with https://opensource.google/projects/pdfium. Also, see https://cs.chromium.org/chromium/src/pdf/pdfium/pdfium_print.cc?g=0. I'm assuming Opera wrote some custom code for the "Save as PDF" function that makes use of PDFium. But, theat custom code probably isn't available to the public. But, don't really know for sure.

On a side, there might be a "Save as PDF" extension that does things better than Opera's feature. You can look at https://chrome.google.com/webstore/search/save as pdf?_category=extensions and https://addons.opera.com/en/search/?query=pdf.

It is a pity that we have such asymmetry. I think it is not a true bug. Just developers have had some trouble with it. And they implemented this asymmetric approach.

Do you know where do i can see programme code of this functional or it is not a public code?

test.html:

<script>
    window.addEventListener("DOMContentLoaded", function() {
        var a = document.createElement("a");
        a.href = "https://example.com/";
        a.textContent = "Am I clickable in a PDF?";
        document.body.appendChild(a);
    });
</script>

Load test.html in Opera, right-click the page and choose "save as pdf". Then, open the PDF and see if it's clickable. If it's not, it means Opera doesn't detect dynamically-added links. If so, it's something Opera should fix if possible.

I don't know if it's due to an actual bug or if the code that generates the PDF is just limited in how it detects HTML links.

On https://forums.opera.com/category/11/opera-for-windows, if you right-click on a link to a thread and inspect it, you can see that it is indeed an HTML anchor element and not some other element that's just made clickable by Javascript. Given that, I'm assuming the the "Save as PDF" code just isn't picking up those anchor elements because they're added to the page dynamically with Javascript or something in a way that causes them not to be detected.

Given that, I would assume Opera could be improved to catch more links.